From The Longmont Times-Call (Sam Lounsberry):
Boulder County biologists studying Preble’s meadow jumping mouse and fish populations along the St. Vrain Creek have been encouraged this summer by signs of species rejuvenating since their habitats were altered by the 2013 flood…
Restoration efforts also have been conducive to bolstering populations of certain “transition zone” fish that need shady habitat and water temperatures between the colder sections of stream at higher elevations and the warmer sections through Longmont and east of the city.
Fish trends promising, concerns remain
As Boulder County wildlife biologist Mac Kobza has tallied fish caught by his team of six research assistants this summer along the St. Vrain, he’s chalked up seven species, an improvement in the river’s fish diversity over the past five years.
White suckers, brown trout and minnows like johnny darters and longnose daces were among those caught and documented Tuesday, adding to the counts of fish in the area tracked this summer and for the past five years by Kobza…
Diversion dams and other irrigation ditch structures that pull water from the St. Vrain to deliver it to other water rights holders since the flood have been redesigned in some places to allow easier fish passage, but some ditch companies have hesitated to modify their apparatus.
“I think they’re resistant because it can be expensive. Colorado Parks and Wildlife is trying to work with those ditch companies and provide some of the funding to allow (more fish passage) to happen,” Longmont Land Program Administrator Dan Wolford said.